Cosmic Guerilla could be said to be a cousin of Space Invaders, in
that you control a moving gun at the base of the screen which zoomes
to and fro as you attempt to destroy the aliens.
However, the scenario is quite different; the alien 'guerillas' sneak
in from both sides of the screen at once, trying to reach the centre
where they steal a supply of 'pod' which they then have to take back
the way they came.
Thus you have irregular groups of aliens moving independently in
different directions at the same time; their movement is in erratic
bursts so that it can be difficult to judge when any individual will
take his next 'step'. A randomly generated saucer passes periodically
across the top of the screen, a la Space Invaders; you get a higher
score for successfully hitting this.
Your job is to shoot the guerillas before they return home with
their stolen goods. If you hit one on its return journey, its 'pod'
will be abandoned there until another alien comes to fetch it; as
these black blobs block the energy pulses from your gun the game
becomes more difficult as more of them are left lying around.
The aliens can also destroy you with their own bombs (you have
three 'lives'). You have shields against these, but as the
bombs do not come often and the shields tend to get in your own
way, I found that it was a good policy to blast them out of existence
at the beginning of each game.
You have a choice of three speeds, and score is displayed on screen.
High scorers can enter their names in a 'hall of fame' at the end
of the game.
Having played other games of the same type, I did not find that it
held my interest for long; but the sneaky way that the aliens move and
their tendency to attack in bunches is a novelty.
The game is well produced, loads easily and runs smoothly; I found that
the controls respond almost too quickly - you need a very light touch
to position your gun where you want it. Instructions are minimal, but
the only controls necessary are Right, Left and Fire. The program can be
used with the QS Sound and Characters board, if available.